不确定您选择了解决问题的最佳方法。
就是说，我不喜欢（也有政策禁止）以“不”回答问题，所以这里…
看一看
FilterInputStream。
从文档中：
FilterInputStream包含其他一些输入流，它用作其基本数据源， 可能会沿途转换数据 或提供其他功能。
编写它是一个有趣的练习。这是为您提供的完整示例：
import java.io.*;import java.util.*;class ReplacingInputStream extends FilterInputStream { linkedList<Integer> inQueue = new linkedList<Integer>(); linkedList<Integer> outQueue = new linkedList<Integer>(); final byte[] search, replacement; protected ReplacingInputStream(InputStream in, byte[] search, byte[] replacement) { super(in); this.search = search; this.replacement = replacement; } private boolean isMatchFound() { Iterator<Integer> inIter = inQueue.iterator(); for (int i = 0; i < search.length; i++) if (!inIter.hasNext() || search[i] != inIter.next()) return false; return true; } private void readAhead() throws IOException { // Work up some look-ahead. while (inQueue.size() < search.length) { int next = super.read(); inQueue.offer(next); if (next == -1) break; } } @Override public int read() throws IOException { // Next byte already determined. if (outQueue.isEmpty()) { readAhead(); if (isMatchFound()) { for (int i = 0; i < search.length; i++) inQueue.remove(); for (byte b : replacement) outQueue.offer((int) b); } else outQueue.add(inQueue.remove()); } return outQueue.remove(); } // TODO: Override the other read methods.}用法示例
class Test { public static void main(String[] args) throws Exception { byte[] bytes = "hello xyz world.".getBytes("UTF-8"); ByteArrayInputStream bis = new ByteArrayInputStream(bytes); byte[] search = "xyz".getBytes("UTF-8"); byte[] replacement = "abc".getBytes("UTF-8"); InputStream ris = new ReplacingInputStream(bis, search, replacement); ByteArrayOutputStream bos = new ByteArrayOutputStream(); int b; while (-1 != (b = ris.read())) bos.write(b); System.out.println(new String(bos.toByteArray())); }}给定要
"Hello xyz world"打印的字符串的字节数：
Hello abc world
